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Add ExceptionMessages/RequireMessage cop

Opt-in cop that flags a bare `raise SomeError` (or `raise SomeError.new`)
with no message, since a message-less raise leaves nothing but the class
name to go on in a backtrace. `AllowedExceptions` allowlists exception
classes that don't need a message, and defaults to `NotImplementedError`,
since it's conventionally raised bare (e.g. for an abstract method, or a
feature unsupported on the current platform); RuboCop array config
replaces rather than merges, so a custom `AllowedExceptions` must repeat
`NotImplementedError` to keep it exempted.

Also documents in AGENTS.md that README examples use the
`raise Class, "message"` form for brevity unless the choice of raise
form is itself what a cop checks.

Closes #15.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

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